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Full text of "Circuits"

Circuit Skills: LED Color Organ 



Make] Projects 



Circuit Skills: LED Color Organ 

Written By: Marc de Vinck 



TOOLS: 


PARTS: 


Soldering/desoldering tools (1) 


Color organ parts kit (1) 


Wire cutter/stripper (1) 





SUMMARY 

Long before the dawn of digital music, folks employed the power of the electric color organ 
(aka "light organ") to add some synced visuals to their hi-fi experience. Schematics for 
building such a beast based on AC power and incandescent bulbs can be be found fairly 
easily on the web , but plans for comparable LED-based designs seem a bit harder to come 
by. 

Adapted from Aaron Cake's 3 Channel Spectrum Analyzer . Collin built his own analog LED 
Color Organ to enhance the aural experience. The circuit uses 4 operational amplifiers plus 
ultra-bright 5mm LEDs to respond visually for bass, mid, and treble frequencies. 



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Circuit Skills: LED Color Organ 



Step 1 — Circuit Skills: LED Color Organ 




• The circuit uses 4 operational 
amplifiers plus ultra-bright 5mm 
LEDs to respond visually for bass, 
mid, and treble frequencies. 



Step 2 









-v+ 

-? 


A 

V— 

\- 






6.6mm » 





• In order to simplify the construction 
process, Collin drew up and printed 
a label specifying the pinout for 
quad op amp ICs. 



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Page 2 of 2